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Explain four causes for failures in data warehouse projects
What is a Database? To know what database is, we have to start from data, which is the basic building block of any DBMS. Data: Facts, figures, statistics etc. having no pa
What does data dictionary is a special file contains ? The data dictionary is a special file contain The name of all fields in all files.The width of all fields in all files an
What is Cross Product? Simply Cross product is Binary Operator
Having Clause with sub queries: First we have to recollect the GROUP BYclause. The following query searches the minimum salary in every department. SELECT DEPTNO, MIN (SAL)
Logical Operators Rules of Precedence: Order evaluated Operator 1 All comparison operators 2
What are called multilevel indices? Indices with two or more levels are known as multilevel indices.
What is the difference among a primary index and a secondary index? Primary Index: A primary index is an ordered file whose records are of fixed length along with two fields.
List the drawbacks of relational database system A) Repetition of data B) Inability to s certain information.
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